Evasion when asked: if a supplier does not clarify when asked specifically for method details, counter-ion form, or batch origin, that itself is a red flag worth documenting.
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Sourcing · Red flags · continued
A supplier that answers analytical questions with restated claims posts 61–90
This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1 · go to the accepted answer.
If someone has run supplier properly I would rather read that than my own reconstruction of it. Posting mine only because the thread has gone quiet.
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Collapsed as off-topic by two members at trust level 3 or above
Picking up post #61: that is the part I would want checked first.
The reason supplier keeps being re-asked is that the answer is conditional and people quote it without the condition. It is not that the answer is unknown.
Rapid supplier turnover: a supplier that changes corporate structure, domain name, or contact repeatedly in short time windows raises suspicion about stability and legitimacy.
The disagreement above is smaller than it looks once the terms are fixed.
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r.mwangi, post #51: Nothing to add, except that this is the answer I would give if asked. Go to post
That matches what I have seen, for whatever a single anecdote is worth.
My experience of supplier contradicts the reply above. I am posting it as a data point rather than as a refutation, because one person's experience is exactly that.
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Narrowing post #68, because the general version has more than one answer.
The guidelines draw that line for a practical reason as much as a fair one: reports accumulate into something useful and allegations do not.
The reasoning is more useful than the number, which is why I have shown it.
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crossref_check, post #23: The arithmetic in post #21 is right; the assumption feeding it is the part to check. A supplier changing batch nomenclature is not a warning sign, and it does make historical comparison harder until a mapping exists. Go to post
Exaggerated claims without documentation: every compound has limits. No peptide is "100% pure" because purity is measured to finite precision. A supplier claiming implausible perfection without backing evidence is overreaching.
A qualification I should have led with rather than closed on.
Worth separating two things that post #69 runs together.
Documentation quality as a signal: a supplier that reports method identifiers, distinguishes specification from result, and states the counter-ion form is telling you something about systems behind the document. A certificate that is a number and a signature tells you less.
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This follows post #73 rather than contradicting it.
The most useful contribution to this subcategory is a resolved case written up with the resolution, because the unresolved ones are all anyone remembers.
I have separated what I observed from what I concluded, which does not always happen.
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r.oyelaran, post #32: The most useful contribution to this subcategory is a resolved case written up with the resolution, because the unresolved ones are all anyone remembers. That much is documented. The rest is how I have interpreted it. Go to post
Safety documentation absent: a supplier that cannot provide information about sterility testing, endotoxin testing, or safety documentation when asked is raising flags.
That is where I would start, not where I would stop.
Adding a data point of agreement rather than a data point.
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Tavares, post #58: Being wrong in public about a supplier is costly to that supplier and to the person who was wrong. That is why the evidence standard is what it is. The short answer was in the first line; everything after is the working. Go to post
Two claims get bundled together under supplier and they need separating. The descriptive one — this is what was observed — is usually well supported. The causal one — this is why — usually is not.
Almost every disagreement in threads like this one dissolves once you say which of the two you are making.
n.duarte, post #24: Prices well below the rest of the market are a fact rather than a finding. They are worth noting and they do not establish anything on their own. That is all the detail I have. Someone else will have more. Go to post
I had read the opposite somewhere and cannot now find where, which tells me something.
That is a cleaner way of putting what I was circling around.
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Inconsistency across documents: a certificate stating one purity, a website claiming another, and a supplier's verbal representation claiming a third, all on the same product, is a red flag for either incompetence or deception.
It is the sort of thing that seems obvious in retrospect and was not at the time.
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endo_fellow_rk, post #15: Where I part company with post #11, and it is a narrow parting. Reporting rather than recommending, on supplier. What happened is above. Whether it should have is a different question and not one I am qualified to answer. Go to post
Something worth flagging about supplier: the strongest-sounding claims in this thread are the ones with no source attached, which is the usual pattern and not a coincidence.
Everything in post #82 holds. The case it does not cover is the one I have.
Reframing supplier slightly, because I think the disagreement is about the question rather than the answer. If the question is "does it happen", yes. If it is "how often", nobody here knows.
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This follows post #82 rather than contradicting it.
Anonymity: a supplier that will not disclose legal name, address, or responsible person is not operating in a way that allows accountability.
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r.sobczak, post #64: Prices well below the rest of the market are a fact rather than a finding. They are worth noting and they do not establish anything on their own. Go to post
The most useful contribution to this subcategory is a resolved case written up with the resolution, because the unresolved ones are all anyone remembers.
m.nwosu, post #7: Genuine question rather than a rhetorical one: has anyone here actually observed supplier, as opposed to read about it? The thread is long and I cannot tell. Go to post
If you are new and reading this thread for the answer to supplier: the answer is conditional, the conditions are in the third reply, and the rest of the thread is worth skipping.
Keep the two claims separate. "The result on this lot did not match the certificate" is a report that can be checked. "This supplier is dishonest" is an allegation about intent and nothing in a chromatogram supports it.
The interesting part of this is the exception, and I do not understand the exception.
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